JPH0522086A - Parabola signal generator - Google Patents
Parabola signal generatorInfo
- Publication number
- JPH0522086A JPH0522086A JP3172537A JP17253791A JPH0522086A JP H0522086 A JPH0522086 A JP H0522086A JP 3172537 A JP3172537 A JP 3172537A JP 17253791 A JP17253791 A JP 17253791A JP H0522086 A JPH0522086 A JP H0522086A
- Authority
- JP
- Japan
- Prior art keywords
- amplifier
- absolute value
- output
- circuit
- value circuit
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K4/00—Generating pulses having essentially a finite slope or stepped portions
- H03K4/04—Generating pulses having essentially a finite slope or stepped portions having parabolic shape
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
- H04N3/00—Scanning details of television systems; Combination thereof with generation of supply voltages
- H04N3/10—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical
- H04N3/16—Scanning details of television systems; Combination thereof with generation of supply voltages by means not exclusively optical-mechanical by deflecting electron beam in cathode-ray tube, e.g. scanning corrections
Landscapes
- Engineering & Computer Science (AREA)
- Multimedia (AREA)
- Signal Processing (AREA)
- Details Of Television Scanning (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、テレビジョン受像機や
ディスプレイの偏向回路やダイナミックフォーカス回路
（以下ＤＡＦと称す）における、パラボラ信号発生装置
に関するものである。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a parabolic signal generator in a deflection circuit or a dynamic focus circuit (hereinafter referred to as DAF) of a television receiver or a display.
【０００２】[0002]
【従来の技術】近年、テレビジョン受像機やディスプレ
イの大型画面化に伴う陰極線管（以下ＣＲＴとの略称す
る）のフォーカス特性向上の為、ＤＡＦ回路が導入され
ＣＲＴの周辺フォーカス特性を向上させてきている。Ｄ
ＡＦ回路においてはパラボラ波形を発生させ、ＣＲＴの
フォーカス端子に重ねあわせてその目的を達成してい
る。2. Description of the Related Art In recent years, in order to improve the focus characteristics of a cathode ray tube (hereinafter abbreviated as CRT) accompanying the increase in screen size of television receivers and displays, a DAF circuit has been introduced to improve the peripheral focus characteristics of the CRT. ing. D
In the AF circuit, a parabolic waveform is generated and superimposed on the focus terminal of the CRT to achieve the purpose.
【０００３】以下に従来のパラボラ信号発生器について
説明する。図２は従来のパラボラ信号発生器示すもので
ある。図２において１は鋸波状波発生回路、３は絶対値
回路、５、７、１０、１４、１７、２４は抵抗、６、
８、９、１１、１２、１３、１５、１６はダイオードで
ある。A conventional parabolic signal generator will be described below. FIG. 2 shows a conventional parabolic signal generator. In FIG. 2, 1 is a sawtooth wave generation circuit, 3 is an absolute value circuit, 5, 7, 10, 14, 17, 24 are resistors, 6,
Reference numerals 8, 9, 11, 12, 13, 15, 16 are diodes.
【０００４】以上のように構成された従来例について、
以下その動作について説明する。鋸波状波発生回路１
は、一般的には偏向コイルに流れる電流を図３（ａ）に
示す電圧に変換し、さらに絶対値回路３により、鋸波状
波の中心で折り返して図３（ｂ）の波形を作りさらに抵
抗５、７、１０、１４、１７、２４とダイオード６、
８、９、１１、１２、１３、１５、１６で構成される折
れ線近似回路において、ダイオードがオンするに従って
ダイオードに直列に入っている抵抗がパラレル接続され
るようにしてパラボラ波形を発生させていた。Regarding the conventional example configured as described above,
The operation will be described below. Sawtooth wave generation circuit 1
Generally converts the current flowing in the deflection coil into the voltage shown in FIG. 3 (a), and further folds it at the center of the sawtooth wave by the absolute value circuit 3 to form the waveform of FIG. 5, 7, 10, 14, 17, 24 and diode 6,
In the broken line approximation circuit composed of 8, 9, 11, 12, 13, 15, and 16, the parabolic waveform is generated by connecting the resistors in series with the diode in parallel as the diode is turned on. .
【０００５】[0005]
【発明が解決しようとする課題】しかしながら、上記の
従来の構成では、ダイオード特性を利用する為に温度特
性によってパラボラ波形が変化し、さらにパラボラ波形
の波形率（一般的にはパラボラ波形は、入力をＸとして
出力をＹとすればHowever, in the above-mentioned conventional structure, the parabolic waveform changes due to the temperature characteristic because the diode characteristic is utilized, and the waveform ratio of the parabolic waveform (generally, the parabolic waveform is Let X be the output and Y be the output
【０００６】[0006]
【数１】 [Equation 1]
【０００７】αは実数）を、ＣＲＴのフォーカス特性が
変更された時またはＣＲＴのインチ数が変更された場合
には、上記抵抗値とダイオードの個数など再設計する必
要があると言う問題点を有していた。[Alpha] is a real number. However, when the focus characteristic of the CRT is changed or the number of inches of the CRT is changed, it is necessary to redesign the resistance value and the number of diodes. Had.
【０００８】本発明は、上記従来の問題点を解決するも
ので、対数アンプと直線アンプと逆対数アンプにより
（数１）を実現し、さらに対数アンプの入力において、
対数は正の実数に対して定義されるため、対数アンプの
リファレンス電圧以上の電圧を対数アンプに入力する必
要があるので、対数アンプの前段である絶対値回路のレ
ファレンスを対数アンプのリファレンスと同一にする事
により対数アンプの入力が未定義状態にならないパラボ
ラ信号発生装置を提供することを目的とする。The present invention solves the above-mentioned conventional problems, and realizes (Equation 1) by a logarithmic amplifier, a linear amplifier, and an antilogarithmic amplifier, and further, at the input of the logarithmic amplifier,
Since the logarithm is defined for a positive real number, it is necessary to input a voltage higher than the reference voltage of the logarithmic amplifier to the logarithmic amplifier. Therefore, the reference of the absolute value circuit that precedes the logarithmic amplifier is the same as the reference of the logarithmic amplifier. It is an object of the present invention to provide a parabolic signal generator in which the input of the logarithmic amplifier does not enter an undefined state.
【０００９】[0009]
【課題を解決するための手段】この目的を達成するため
に本発明のパラボラ信号発生装置は、同期パルスを鋸歯
状波発生回路に入力し、鋸歯状波発生回路出力を絶対値
回路に入力し、絶対値回路の出力を対数アンプに入力
し、対数アンプの出力を直線アンプに入力し、直線アン
プの出力を逆対数アンプに入力すると言う特徴を持ち、
さらに上記構成において、絶対値回路、対数アンプ、直
線アンプ、逆対数アンプの電源は片電源（単電源）で、
絶対値回路、対数アンプ、直線アンプ、逆対数アンプ
の各々のリファレンス入力端子は共通の電圧でバイアス
されているという構成を有している。To achieve this object, the parabolic signal generator of the present invention inputs a synchronizing pulse into a sawtooth wave generating circuit and inputs a sawtooth wave generating circuit output into an absolute value circuit. , The characteristic that the output of the absolute value circuit is input to the logarithmic amplifier, the output of the logarithmic amplifier is input to the linear amplifier, and the output of the linear amplifier is input to the antilogarithmic amplifier,
Further, in the above configuration, the absolute value circuit, the logarithmic amplifier, the linear amplifier, and the antilogarithmic amplifier are powered by a single power supply (single power supply).
The reference input terminals of the absolute value circuit, the logarithmic amplifier, the linear amplifier, and the antilogarithmic amplifier are biased with a common voltage.
【００１０】[0010]
【作用】この構成によって、直線アンプのゲインを変え
る（一般的には二つの抵抗の抵抗比率）ことで（数１）
のαを決定できる為に、αがＣＲＴの特性として決定さ
れていれば直線アンプのゲインをαに設定すればよく、
さらに対数アンプにおいて入力信号の電圧値が対数アン
プのリファレンス以上になる事が保証される。With this configuration, by changing the gain of the linear amplifier (generally, the resistance ratio of two resistors) (Equation 1)
Since α can be determined, if α is determined as the characteristic of the CRT, the gain of the linear amplifier can be set to α.
Further, in the logarithmic amplifier, it is guaranteed that the voltage value of the input signal becomes equal to or higher than the reference of the logarithmic amplifier.
【００１１】[0011]
【実施例】以下本発明の一実施例について、図面を参照
しながら説明する。 図１において、１は鋸歯状波発生
回路、２は鋸歯状波信号、１９は鋸歯状波信号２を入旅
する絶対値回路、４は絶対値回路１９の出力信号、２０
は絶対値回路１９の出力を入力とする対数アンプ、２１
は対数アンプ２０の出力を入力する直線アンプ、２２は
直線アンプ２１の出力を入力する逆対数アンプ、２３は
リファレンス電圧入力端子、１８は（数１）のＹを示す
出力（αは直線アンプ２１のゲイン）信号の出力端であ
る。DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to the drawings. In FIG. 1, 1 is a sawtooth wave generation circuit, 2 is a sawtooth wave signal, 19 is an absolute value circuit for traveling the sawtooth wave signal 2, 4 is an output signal of the absolute value circuit 19, 20
Is a logarithmic amplifier whose input is the output of the absolute value circuit 19, and 21
Is a linear amplifier for inputting the output of the logarithmic amplifier 20, 22 is an inverse logarithmic amplifier for inputting the output of the linear amplifier 21, 23 is a reference voltage input terminal, 18 is an output indicating Y of (Equation 1) (α is the linear amplifier 21 Gain) is the output end of the signal.
【００１２】以上のように構成されたパラボラ信号発生
回路において、図１、図３を用いてその動作を説明す
る。The operation of the parabolic signal generation circuit configured as described above will be described with reference to FIGS. 1 and 3.
【００１３】図３（ａ）の鋸歯状波信号２が絶対値回路
１９に入力されると、図３（ｂ）に示す絶対値回路１９
の出力信号４が得られる。ここで、リファレンス電圧Ｖ
ｒｅｆは図３（ａ）に示すように、鋸歯状波信号２のセ
ンターに設定している。よって図３（ａ），（ｂ）のＡ
点の電圧はリファレンス電圧Ｖｒｅｆより下がる事はな
いので後段の対数アンプ２０の未定義電圧になる事はな
い。When the sawtooth wave signal 2 of FIG. 3A is input to the absolute value circuit 19, the absolute value circuit 19 shown in FIG.
Output signal 4 is obtained. Here, the reference voltage V
As shown in FIG. 3A, ref is set to the center of the sawtooth wave signal 2. Therefore, A in FIGS. 3 (a) and 3 (b)
Since the voltage at the point does not fall below the reference voltage Vref, it does not become the undefined voltage of the logarithmic amplifier 20 in the subsequent stage.
【００１４】ここで、対数アンプ２０、直線アンプ２
１、逆対数アンプ２２で（数１）が表されることを式を
用いて示す。Here, the logarithmic amplifier 20 and the linear amplifier 2
1 shows that the equation (1) is represented by the antilogarithmic amplifier 22 using an equation.
【００１５】ここで、入力電圧をＸとし、対数アンプ２
０の出力をＹｌとし、直線アンプ２１の出力をＹａと
し、逆対数アンプ２２の出力をＹｏとすれば、おのおの
の出力Ｙ１、Ｙａ、Ｙｏは、Here, the input voltage is X, and the logarithmic amplifier 2
If the output of 0 is Y1, the output of the linear amplifier 21 is Ya, and the output of the antilogarithmic amplifier 22 is Yo, the outputs Y1, Ya, and Yo are
【００１６】[0016]
【数２】 [Equation 2]
【００１７】[0017]
【数３】 [Equation 3]
【００１８】[0018]
【数４】 [Equation 4]
【００１９】となる。It becomes
【００２０】[0020]
【発明の効果】以上のように本発明は絶対値回路のリフ
ァレンス電圧と対数アンプ以降のリファレンス電圧を同
一にすることにより、対数アンプ入力に対して、未定義
領域を使用することがなくなり、さらに（数１）のαを
直線アンプのゲインの設定で変更が可能な為、ＣＲＴが
変わった時での設計変更が簡単になる。また（数１）
（数２）（数３）（数４）に示されるように数式で表現
出来るのでパラボラ波形の精度がよい。以上によって、
設計の効率化が図れる利点をもち、さらに図１の構成は
集積回路化するのに適しているので、コストダウンが図
れ、また、従来例ではダイオードの温度特性による波形
への影響も、本発明によれば除去する事ができる優れた
パラボラ波形発生器を実現できるものである。As described above, according to the present invention, by making the reference voltage of the absolute value circuit and the reference voltage after the logarithmic amplifier the same, the undefined area is not used for the logarithmic amplifier input. Since α in (Equation 1) can be changed by setting the gain of the linear amplifier, the design can be easily changed when the CRT is changed. Also (Equation 1)
Since it can be expressed by a mathematical formula as shown in (Equation 2), (Equation 3) and (Equation 4), the accuracy of the parabolic waveform is good. By the above,
Since the structure of FIG. 1 is suitable for integration into an integrated circuit, the cost can be reduced, and in the conventional example, the influence of the temperature characteristic of the diode on the waveform is also improved. According to this, an excellent parabolic waveform generator that can be removed can be realized.
【図１】本発明の一実施例におけるパラボラ信号発生装
置のブロック図FIG. 1 is a block diagram of a parabolic signal generator according to an embodiment of the present invention.
【図２】従来のパラボラ信号発生装置の回路図FIG. 2 is a circuit diagram of a conventional parabolic signal generator.
【図３】（ａ）は鋸歯状波信号の波形図 （ｂ）は絶対値回路の出力信号の波形図FIG. 3A is a waveform diagram of a sawtooth wave signal. (B) Waveform diagram of the output signal of the absolute value circuit
１ 鋸歯状波発生回路 ３ 絶対値回路 １９ 絶対値回路 ２０ 対数アンプ ２１ 直線アンプ ２２ 逆対数アンプ ２３ レファレンス電圧入力端 1 Sawtooth wave generation circuit 3 Absolute value circuit 19 Absolute value circuit 20 logarithmic amplifier 21 Linear amplifier 22 Antilogarithmic amplifier 23 Reference voltage input terminal
Claims (2)
し、鋸歯状波発生回路出力を絶対値回路に入力し、絶対
値回路の出力を対数アンプに入力し、対数アンプの出力
を直線アンプに入力し、直線アンプの出力を逆対数アン
プに入力するようにしたパラボラ信号発生装置。1. A synchronous pulse is input to a sawtooth wave generation circuit, an output of the sawtooth wave generation circuit is input to an absolute value circuit, an output of the absolute value circuit is input to a logarithmic amplifier, and an output of the logarithmic amplifier is input to a linear amplifier. Parabolic signal generator that inputs the output of the linear amplifier to the antilogarithmic amplifier.
逆対数アンプの電源は片電源（単電源）で、絶対値回
路、対数アンプ、直線アンプ、逆対数アンプの各々のリ
ファレンス入力端子は共通の電圧でバイアスされている
請求項１記載のパラボラ信号発生装置。2. An absolute value circuit, a logarithmic amplifier, a linear amplifier,
The parabolic signal generator according to claim 1, wherein the power source of the antilogarithmic amplifier is a single power source (single power source), and the reference input terminals of the absolute value circuit, the logarithmic amplifier, the linear amplifier, and the antilogarithmic amplifier are biased with a common voltage. apparatus.
Priority Applications (7)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17253791A JP3318932B2 (en) | 1991-07-12 | 1991-07-12 | Parabolic signal generator |
| US07/909,706 US5223799A (en) | 1991-07-12 | 1992-07-07 | Parabolic signal generator |
| CA002073392A CA2073392C (en) | 1991-07-12 | 1992-07-08 | Parabolic signal generator |
| TW081105432A TW241414B (en) | 1991-07-12 | 1992-07-09 | |
| EP19920306317 EP0532164A3 (en) | 1991-07-12 | 1992-07-09 | Parabolic signal generator |
| AU19549/92A AU631509B1 (en) | 1991-07-12 | 1992-07-09 | Parabolic signal generator |
| KR1019920012279A KR960007262B1 (en) | 1991-07-12 | 1992-07-10 | Parabolic signal generator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP17253791A JP3318932B2 (en) | 1991-07-12 | 1991-07-12 | Parabolic signal generator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH0522086A true JPH0522086A (en) | 1993-01-29 |
| JP3318932B2 JP3318932B2 (en) | 2002-08-26 |
Family
ID=15943737
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP17253791A Expired - Fee Related JP3318932B2 (en) | 1991-07-12 | 1991-07-12 | Parabolic signal generator |
Country Status (7)
| Country | Link |
|---|---|
| US (1) | US5223799A (en) |
| EP (1) | EP0532164A3 (en) |
| JP (1) | JP3318932B2 (en) |
| KR (1) | KR960007262B1 (en) |
| AU (1) | AU631509B1 (en) |
| CA (1) | CA2073392C (en) |
| TW (1) | TW241414B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH06339148A (en) * | 1993-03-29 | 1994-12-06 | Hitachi Ltd | Color correction device, picture display device using the correction device, white balance adjustment system consisting of the display device, white balance adjustment method and color adjustment method |
| CN101042977B (en) | 2006-03-22 | 2011-12-21 | 清华大学 | Carbon nanotube field emission type electron source and its manufacturing method |
| CN100573783C (en) | 2006-04-05 | 2009-12-23 | 清华大学 | The manufacture method of carbon nano tube field transmitting electronic source |
| CN106169912B (en) * | 2016-06-28 | 2018-03-16 | 浙江中医药大学 | Pulse wave generation circuit |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3714505A (en) * | 1970-12-01 | 1973-01-30 | Bell Telephone Labor Inc | Dynamic focus correction apparatus for a rectilinearly raster scanned electron beam |
| JPS5928352A (en) * | 1982-08-09 | 1984-02-15 | Hitachi Ltd | Positioning device and wire bonded equipped therewith |
| US4849652A (en) * | 1986-12-01 | 1989-07-18 | U.S. Philips Corporation | Circuit for producing a periodic, essentially parabolic signal |
| JPH06101674B2 (en) * | 1988-09-20 | 1994-12-12 | 三洋電機株式会社 | Parabolic wave generation circuit |
| NL8901147A (en) * | 1989-05-08 | 1990-12-03 | Philips Nv | CIRCUIT FOR DELIVERING A PERIODIC IN ESSENTIAL PARABOLIC SIGNAL. |
| JP3182759B2 (en) * | 1990-09-05 | 2001-07-03 | ソニー株式会社 | Parabolic wave generation circuit |
-
1991
- 1991-07-12 JP JP17253791A patent/JP3318932B2/en not_active Expired - Fee Related
-
1992
- 1992-07-07 US US07/909,706 patent/US5223799A/en not_active Expired - Fee Related
- 1992-07-08 CA CA002073392A patent/CA2073392C/en not_active Expired - Fee Related
- 1992-07-09 EP EP19920306317 patent/EP0532164A3/en not_active Ceased
- 1992-07-09 TW TW081105432A patent/TW241414B/zh active
- 1992-07-09 AU AU19549/92A patent/AU631509B1/en not_active Ceased
- 1992-07-10 KR KR1019920012279A patent/KR960007262B1/en not_active IP Right Cessation
Also Published As
| Publication number | Publication date |
|---|---|
| CA2073392A1 (en) | 1993-01-13 |
| AU631509B1 (en) | 1992-11-26 |
| US5223799A (en) | 1993-06-29 |
| EP0532164A2 (en) | 1993-03-17 |
| KR930003666A (en) | 1993-02-24 |
| CA2073392C (en) | 1998-07-21 |
| KR960007262B1 (en) | 1996-05-29 |
| TW241414B (en) | 1995-02-21 |
| JP3318932B2 (en) | 2002-08-26 |
| EP0532164A3 (en) | 1994-07-20 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US2621292A (en) | Electrical integrating circuit arrangement | |
| US4216392A (en) | Circuit for producing a periodic parabolic signal | |
| JPH0522086A (en) | Parabola signal generator | |
| US3725726A (en) | Crt geometry correction with zero offset | |
| US4536682A (en) | Circuit for generating a deflection current through the field deflection coil of a picture display device | |
| JPS59170773A (en) | Wave-form display signal generator | |
| US4613776A (en) | Voltage to current conversion circuit | |
| GB2044576A (en) | Aperture correction signal processing circuit for television receiver | |
| JPH07202593A (en) | Voltage current conversion circuit | |
| KR850008077A (en) | Convergence Circuit | |
| JP2001268386A (en) | Dynamic focus waveform shaping circuit | |
| US3896339A (en) | Device for focussing and deflection of an electron beam in a cathode-ray apparatus | |
| JP2881810B2 (en) | Blanking circuit | |
| SU924823A1 (en) | Scanning current amplifier | |
| JPH0299042A (en) | Ultrasonic diagnostic apparatus | |
| JPH0197069A (en) | Gamma-correcting circuit | |
| JPS6227845Y2 (en) | ||
| JPS5834552A (en) | Electrostatic deflection circuit | |
| JPH0575885A (en) | Focus circuit | |
| JPS63309010A (en) | Electronic variable resistor circuit | |
| JPH0854231A (en) | Distance measurement signal processor | |
| JPH0835991A (en) | Signal generator for inspecting accuracy of vertical axis of oscilloscope | |
| KR20040078410A (en) | Gamma correction device | |
| JP2000134500A (en) | Dynamic focus circuit | |
| JPH04284017A (en) | Pulse width expander |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |